SERICEOUS
downy, pubescent, puberulent, sericeous
(adjective) covered with fine soft hairs or down; “downy milkweed seeds”
Source: WordNet® 3.1
Etymology
Adjective
sericeous (comparative more sericeous, superlative most sericeous)
Of or relating to silk; consisting of silk; silky.
(botany) Covered with very soft hairs pressed close to the surface.
(zoology) Having a silky lustre, usually due to fine, close hairs.
Source: Wiktionary
Se*ri"ceous, a. Etym: [L. sericus silken, sericum Seric stuff, silk,
fr. Sericus belonging to the Seres, Gr. Silk, Serge a woolen stuff.]
1. Of or pertaining to silk; consisting of silk; silky.
2. (Bot.)
Definition: Covered with very soft hairs pressed close to the surface; as,
a sericeous leaf.
3. (Zoöl.)
Definition: Having a silklike luster, usually due to fine, close hairs.
Source: Webster’s Unabridged Dictionary 1913 Edition